# IsI Notebook vs Serious Notebook

The clearest difference is rating: Serious Notebook at 5.0 against IsI Notebook's 2.8. Serious Notebook also leads on update cadence (every 3 weeks vs every 20 months). IsI Notebook's advantage is ratings volume (12 vs 1) and iOS requirement (8.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. IsI Notebook sells 2 one-off in-app purchases and Serious Notebook sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Serious Notebook holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: IsI Notebook has 12 ratings behind it against 1, so its average is the more settled of the two.

IsI Notebook ships an update every 20 months, Serious Notebook every 3 weeks. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | IsI Notebook | Serious Notebook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (12 ratings)](https://appshunter.io/ios/app/isi-notebook/id967009664/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/serious-notebook/id6769515671/reviews)** |
| Number of ratings | **12** | 1 |
| Positive reviews | 22.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 9 MB | 6 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dominic Barra](https://appshunter.io/developer/891093115) | [BILGESU KADAN](https://appshunter.io/developer/1896346142) |

## What reviewers say

### IsI Notebook

[App page](https://appshunter.io/ios/app/isi-notebook/id967009664)

This app allows users to quickly write and read notes on two different notepads simultaneously on a single screen. Additional features like more notepads, font customization, and ad removal are available through in-app purchases.

**Highlights:** Simultaneous note-taking on two screens, Rapid data storage and retrieval, Expandable to 6 notepads, Customizable font size and style, Ad removal option

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get Functions | $0.99 | one-time |
| No Ads | $0.99 | one-time |


### Serious Notebook

[App page](https://appshunter.io/ios/app/serious-notebook/id6769515671)

A private digital notebook for handwriting, typing, and annotating documents. Import PDFs, scan paper, and organize your thoughts with customizable tools. Keep your work securely on your device with no accounts or tracking.

**Highlights:** Handwrite and sketch with Apple Pencil, Type notes and highlight on iPhone, Import and annotate PDFs, Scan paper into notebooks, Insert text boxes, sticky notes, photos, and scans, Export notebooks as PDF

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $24.99 | one-time |


## Frequently asked questions

### Is IsI Notebook free?

IsI Notebook is free to download, with in-app purchases available.

### Is Serious Notebook free?

Serious Notebook is free to download, with in-app purchases available.

### Which has better reviews, IsI Notebook or Serious Notebook?

Serious Notebook is rated higher. IsI Notebook averages 2.8 out of 5 from 12 ratings, while Serious Notebook averages 5.0 from 1 ratings.

### Do IsI Notebook or Serious Notebook have ads?

Neither IsI Notebook nor Serious Notebook shows ads.

### Which is updated more often, IsI Notebook or Serious Notebook?

IsI Notebook ships an update every 20 months, and Serious Notebook every 3 weeks. Most recently, IsI Notebook was updated on November 1, 2026 and Serious Notebook on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*